Larry David can't stop cracking up in behind-the-scenes footage from his weirdest 'SNL' sketch.

Larry David's SNLhosting gig this week primarily made headlines for his impersonation of fellow elderly Brooklyn Jew Bernie Sanders. But Larry apparently preferred his "Kevin Roberts" sketch, also known as "FBI Simulator."

In case you missed it because you don't watch SNL offline anymore, the sketch is about a G-man cadet, Kenan Thompson, in firearm training with "lifelike" dummies played by Vanessa Bayer and Bobby Moynihan. Kenan's got to decide who's a threat, who's an innocent, and who the hell is Kevin Roberts.

Larry plays that mysterious Kevin, a "man in a neon suit, holding a cell phone claiming to be the 'coolest bitch in town.'"

Larry, master improviser that he is, still cannot keep himself from giggling like he's chatting with Jeff Greene over a tuna sandwich.